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The post of Leader of the Labour Party was officially created in 1922. Before this time, between when Labour MPs were first elected in 1906 and the election in 1922, when substantial gains were made, the post was known as Chairman of the Parliamentary Labour Party.[1]

Unlike other British political party leaders, the Labour Leader does not have the power to dismiss or appoint their Deputy. Both the Leader and Deputy Leader are elected by an Alternative Vote system. From 1980 to 2014 an electoral college was used, with a third of the votes allocated to the Party's MPs and MEPs, a third to individual members of the Labour Party, and a third to individual members of all affiliated organisations, including socialist societies and trade unions. The 2015 leadership election will use a "one member, one vote" system, in which the votes of party members and members of affiliated organisations are counted equally. MPs and MEPs votes are not counted separately, although a candidate needs to receive the support of 15% of Labour MPs in order to appear on the ballot.

^Labour Party Rule Book 2008(PDF), The Labour Party, retrieved 12 May 2010, When the party is in opposition and the party leader, for whatever reason, becomes permanently unavailable, the deputy leader shall automatically become party leader on a pro-tem basis.